Speedometer



Apr l0, 1923. 1,450,939

c. CARSON SPEEDOMETER Filed Aug. 25,

INVENTOR ma, @A4014 Apr. l0, 1923. 1,450,939

c. CARSON SPEEDOMETER Filed Aug. 25, 1920 2 sheets-sheet 2 6 a VENTO/i' BY www A TTORNE Y Patented Apr. 10. 1923.

PATENT OFFICE.

CLARENCE CARSON, OF NEW ROCHELLE, NEW YORK, ASSIGNOR TO JOHNS-MANVILLE, INCORPORATED, A CORPORATION F NEW YORK.

SPEEDOMETER. 7

Application led August 25, 1920. Serial No. 405,999.

lates specifically to a means for mounting A 16 different size instruments to a sup o rt. l

One ofthe primary objects of t e invention is to lassure an economic production of a plurality of different instnuments by simplifying and `.standardizing certain umts 20 Vand bya roper selection of the least possible num er of stock paresse as to per-.

mitunskilled labor to assemblelany one of the possib1eformsof instrument at low cost and without the necessity Vof carrying a a5 lar e stock of separate parts.

t is appreciated that in the art of devices of the .class,indicated.,diiferent t pes of instruments are required Ain the trae to meet dilerentcommercial conditions. Itis: necessary 1to provide not onliyA different read- V but 1t 1s also..

necessary toV provide different types of cas#- ing scales for use therewit ings for mounting the instruments on dif-I ferently designed Supports, such as dashboards of varying thiclmesses and the different instrument boards now found on airplanes, automobiles and like structures on which such instruments are mounted.

The present invention contemplates the 4o designing of a basic unit constituting the major ortion of thecom leted instrument,

prefer-a l in the form o a rugged casting which wi l have perma nently -mounted thereon certain standard parts common to the different t es of instruments.y This basic unit will e provided with localizing and attaching elements arranged to receive different types .of odometer and tachometer mechanisms and coact therewith so as to modify the basic unit to meet the call for any particularly type. of instrument. It is also within the scope of the invention to construct the basic unit so that it will receive different standardized types of mounting parts thereby to accommodate the assembled instrument to the different types of ,supports upon which it isusual to mount such instruments.

Another object of the invention, and still featuring economy in manufacturing cost is to provide for sucha distribution of material that the basic castin or unit vwhich forms the main part of a of the several instruments shall be designed to carry and distribute .practically all strains on theinstrument andl in which the .covers and attacli'ing partsfshall be made up as cheap stampings from relatively light stock not i inten Various other objects and advantages of the invention will be in part obvious from an inspection: jof. the accompanying drawingszadin. -part will be more fully set forth inl ltlieifollowjing particular description of one f0r.m.:.f. f mechanism .embodying H13/invention,'. and the invention alsoconsists in certain nevhand novel l.features of construction and-combinatmn 'of parts hereinafter set forthand claimed. i

In' the accompanying dra rel isa vertica sectionaview taken axial y. through a-preferred embodiment,otV the invention` -constituting a completely assembled andmounted combined tachometer and odometer an d illustrating two means for mounting the samein position;

- Figures2 and 3 are respectively .rear and side .views ofi the back cover shown in sectionin Figure 1; and

.Figure 4 is a fragmentary 4View of the upper-portion ofthe ,device` shown in Figure Vl,- illustrating a modified means for mounting the same in place. r u

Inpthe followingdescription and in .the claims,- parts will be identified by 4specific names for convenience of expression but they are intended tobe as generic in their application to similar parts as the .art will permit i ,i

Referring to the accompanying drawings` itis noted that the devicelcomprises a ringcasting 10 with a dial plate front and rear covers, shown in Figure-La governor 11 together with its drive shaft 12, an indicating mechanism 4 13 which includes odometer mechanism Mdriven from the governor and a tachometer mechanism 15 actuated by the governor and one or more mounting plates or rings 16, 17 and 18 (see Figures l and 4).

tionallyl designed to receive stresses andV strains.

The casting 10 is provided with tapped holes 25 ad'ap'ted to receive screws 9,6 for securing the indicating mechanism unit 13 to the front end end to secure the back cover 27 to' ihear'en of the casting.

The front end of tle 'a'stiiig is closed by a glass cover 5() held in place by a. glass ring 52 and which includes a band 51 telescoping the casting and 'held 'thereto by screws 53 which pass into screw holes formed in the casting.

The rear cover 27 is in the form of a thin sheet metal stamping and ist provided with a bulging part 54 stamped therefrom to form an outwardly positionedl pocket 55 designed to accommodate the wei 4hts of the governor whenin active distende position. The rear cover is also provided with an opening 56 th'rough which extends the drive shaft neck '34. Th opening is so jdesig'ed'that its o'u'tline projected onto the 'plate will fall1`vvithi the-outline of the plate ,'so that"the'plate, together with 'the neek,'wi11 cover ihepehing' and tluxs4 revent 'the' etrce 'of dirt,

vd ust or other oreign matter into the device Vvided withfari ot'ivirdly"eistend'ingseeur- Y with Screwimlejs designed to receive 'wood orjmachlne 58 for 'stenix'ig tli "same to th'e frnt side of t:i'sippr't 59. This s'uppo'rt may 'be the dashboard shown in Fi Are 1 and whili 1s usuall'j' 'of di'rnt "ivi ths ormay bethe metal instriiiientbord 60 shown 'in Figure 4.

Itis lso suggested that tle ilnstrilrnentbe moiinted either Awith or wi hout the 'fiont mounting ring -16 by a seciiring'trnehns which engages the rear side of the support. One such Vmeans is shown 4in the 'ears 17 which are in the form of L-shaped brackets one flange of each of which is welded to the rear cover. The lugs are spaced circumferentially about the rear cover and are each secured by means of screws 61 to the rear side of the support.

Under son'ie circumstances it is desired to niount the device in position without the necessity of using screws and one such showing is disclosed in Figure 4 where the mounting rino has its flange 63 for engaging the front side of the support of reduced width from the similar showing in Figure 1 :is there i`s "no need to provide space for screw holes. `It isobvious th'at the ears 17 of the showing in Fifvure 1 may be formed into a continuious l@and for engaging the rear side of 'the support and which mav be part of the 're'ar cover or, as shown in vFigure 41 may be formed as a flange 64 constituting an integral p'n'rt of a separate rear cover 65 herei'n identified as a clamping cup. The clmping cup is secured by bolts 66 which p'ss through the cup and through the rear cover,'i cese a rear cover is used.4 By drawing up on'- the bolts"66 it is possible' vto advance the e'ars' or ange '64 into firm bearing 'engagement jwith the rear 'side of the support and thu'slamp the support between the twoin'ointin'gfings.

*sappen be prbvidd with' a slot e7 andthe laving thus described 'my invention, Il

wthseprafe means'for securinf the-saine to' che @chine-mmca13@ pr'vid with '1in ou'tstaiding flange' for engfzggiig the rear side of'th'e support wherebv the support' is disposed Abetween 't'o flanges projecting' 'indepndrtly of 'each other from thel -mechamsm.

2.f A 'device 4for mounting a cylindrical form' foi irdiciting mechanism including a cylindrical bend"xtdn'p't'ed 1to :be fitted to the mechanism and frrieit'ns carried by the band and h'dpted to engage the support forthe de if'ir-e to prevent rotary movement of the band. 4

3. A device for 'mounting an :indica-ting mechanism including means for cl'aiiiping the'dei-'ice'to' the-sup ortand provided with a linger for preventing turning of 'the de rice relative tothe support.

4. A device -for mounting1r nn indicatingr mechanism includingr a rear cover provided with means for securing the aune to the mechanism and provided with means for predevice and means for sevuring the cup in 1o venting movement of the cover relative to proper position relative to the mechanism the mounting. and for securing the cup in position engag- 5. A device for mounting an indicator in the mountin L 5 mechanism including a clamping cup adaptigned at N. in the county of N. Y.

ed to telescope the mechanism and provided and State of N. Y., this 16 day of August, 15 with a pocket to receive part of the in- A. D. 1920. dieator mechanism, said cup adapted at its front edge to engage the mounting for the CLARENCE CARSON. 

